USB sticks get disconnected after a few seconds
Hi guys!
I got a problem with 2 of my 4 USB-Ports on my new iMac 21" (Mai 2012). To the first 2 USB-ports I hooked up my printer and my TimeMachine-HDD. The other ones I use for pluggin' in USB-datasticks . For some time now either one of these problems occur:
The USB-Stick doesn't show up at all - or: it connects for a few seconds, but then the warning appears which says I hadn't remove a disk safely. Apparently this only happens with usb-datasticks. My external harddrives work fine on them.
As long as they appear for some seconds they are also regocnized by the Disk-Utility program. Once I even managed to run the Volume-control; said the stick was fine...
This is what I already tried:
- made sure that the sticks plugg in right (they do)
- formatted the sticks (formatted to Mac OS Journaled extended)
- rebooting the imac (sometimes helps for a few minutes)
- I reset the SMC by shutting down, removing the powerplug for sometime and then booting up again (didn't change a thing)
- I tried to connect other external devices to these USB-ports (USB-keyboard) - most of them work fine!!!
- Thought that maybe it was a problem with MacFuse/NTFS-3G; but I have the same config on my macbook. There the problem doesn't show.
I really do not know what to do next! I rely on the transfer of data per USB-Sticks enormously.
Do you guys have any idea?
Any help would be deeply appreciated.
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